MySQL database innodb cannot be restarted after startup, mysqlinnodb

MySQL database innodb cannot be restarted after startup, mysqlinnodb

Problem description

The computer crashes during use. After the computer restarts, it finds that mysql is not successfully started. Check the error log and find that the innodb problem causes mysql to fail to start.

Error Log

$ mysql.server startStarting MySQL. ERROR! The server quit without updating PID file (/usr/local/var/mysql/fdipzonedeMacBook-Air.local.pid).22:08:37 mysqld_safe Starting mysqld daemon with databases from /usr/local/var/mysql2016-04-23 22:08:38 0 [Warning] TIMESTAMP with implicit DEFAULT value is deprecated. Please use --explicit_defaults_for_timestamp server option (see documentation for more details).2016-04-23 22:08:38 0 [Note] /usr/local/Cellar/mysql/5.6.24/bin/mysqld (mysqld 5.6.24) starting as process 3604 ...2016-04-23 22:08:38 3604 [Warning] Setting lower_case_table_names=2 because file system for /usr/local/var/mysql/ is case insensitive2016-04-23 22:08:38 3604 [Note] Plugin 'FEDERATED' is disabled.2016-04-23 22:08:38 3604 [Note] InnoDB: Using atomics to ref count buffer pool pages2016-04-23 22:08:38 3604 [Note] InnoDB: The InnoDB memory heap is disabled2016-04-23 22:08:38 3604 [Note] InnoDB: Mutexes and rw_locks use GCC atomic builtins2016-04-23 22:08:38 3604 [Note] InnoDB: Memory barrier is not used2016-04-23 22:08:38 3604 [Note] InnoDB: Compressed tables use zlib 1.2.32016-04-23 22:08:38 3604 [Note] InnoDB: Using CPU crc32 instructions2016-04-23 22:08:38 3604 [Note] InnoDB: Initializing buffer pool, size = 128.0M2016-04-23 22:08:38 3604 [Note] InnoDB: Completed initialization of buffer pool2016-04-23 22:08:38 3604 [Note] InnoDB: Highest supported file format is Barracuda.2016-04-23 22:08:38 3604 [Note] InnoDB: Log scan progressed past the checkpoint lsn 689299334402016-04-23 22:08:38 3604 [Note] InnoDB: Database was not shutdown normally!2016-04-23 22:08:38 3604 [Note] InnoDB: Starting crash recovery.2016-04-23 22:08:38 3604 [Note] InnoDB: Reading tablespace information from the .ibd files...2016-04-23 22:08:38 3604 [ERROR] InnoDB: checksum mismatch in tablespace ./test_user/user_recommend_code#P#pmax.ibd (table test_user/user_recommend_code#P#pmax)2016-04-23 22:08:38 3604 [Note] InnoDB: Page size:1024 Pages to analyze:642016-04-23 22:08:38 3604 [Note] InnoDB: Page size: 1024, Possible space_id count:02016-04-23 22:08:38 3604 [Note] InnoDB: Page size:2048 Pages to analyze:482016-04-23 22:08:38 3604 [Note] InnoDB: Page size: 2048, Possible space_id count:02016-04-23 22:08:38 3604 [Note] InnoDB: Page size:4096 Pages to analyze:242016-04-23 22:08:38 3604 [Note] InnoDB: Page size: 4096, Possible space_id count:02016-04-23 22:08:38 3604 [Note] InnoDB: Page size:8192 Pages to analyze:122016-04-23 22:08:38 3604 [Note] InnoDB: Page size: 8192, Possible space_id count:02016-04-23 22:08:38 3604 [Note] InnoDB: Page size:16384 Pages to analyze:62016-04-23 22:08:38 3604 [Note] InnoDB: VALID: space:2947354 page_no:3 page_size:163842016-04-23 22:08:38 3604 [Note] InnoDB: Page size: 16384, Possible space_id count:12016-04-23 22:08:38 3604 [Note] InnoDB: space_id:2947354, Number of pages matched: 1/1 (16384)2016-04-23 22:08:38 3604 [Note] InnoDB: Chosen space:29473542016-04-23 22:08:38 3604 [Note] InnoDB: Restoring page 0 of tablespace 29473542016-04-23 22:08:38 3604 [Warning] InnoDB: Doublewrite does not have page_no=0 of space: 29473542016-04-23 22:08:38 7fff79b9e300 InnoDB: Operating system error number 2 in a file operation.InnoDB: The error means the system cannot find the path specified.InnoDB: If you are installing InnoDB, remember that you must createInnoDB: directories yourself, InnoDB does not create them.InnoDB: Error: could not open single-table tablespace file ./test_user/user_recommend_code#P#pmax.ibdInnoDB: We do not continue the crash recovery, because the table may becomeInnoDB: corrupt if we cannot apply the log records in the InnoDB log to it.InnoDB: To fix the problem and start mysqld:InnoDB: 1) If there is a permission problem in the file and mysqld cannotInnoDB: open the file, you should modify the permissions.InnoDB: 2) If the table is not needed, or you can restore it from a backup,InnoDB: then you can remove the .ibd file, and InnoDB will do a normalInnoDB: crash recovery and ignore that table.InnoDB: 3) If the file system or the disk is broken, and you cannot removeInnoDB: the .ibd file, you can set innodb_force_recovery > 0 in my.cnfInnoDB: and force InnoDB to continue crash recovery here.

Solution

1. If the data is not important or there is a backup, you only need to restore mysql to start

Enter the mysql Directory, which is generally:/usr/local/var/mysql/

Deleteib_logfile*

Deleteibdata*

Delete the physical directories of all databases (for example, if the database is test_db, runrm -rf test_db)

Restart mysql

Re-establish the database or use backup to overwrite

2. if the data is important and there is no backup

Availableinnodb_force_recoveryParameter to allow mysqld to skip the restoration step, start mysqld, export the data, and then recreate the database.

innodb_force_recovery It can be set to 1-6. A large number contains the influence of all the preceding numbers.

1. (srv_force_ignore_0000upt): Ignore the checked upt page.

2. (SRV_FORCE_NO_BACKGROUND): prevents the running of the main thread. If the main thread needs to execute the full purge operation, crash may occur.

3. (SRV_FORCE_NO_TRX_UNDO): no transaction rollback is performed.

4. (SRV_FORCE_NO_IBUF_MERGE): Insert buffer merging is not performed.

5. (SRV_FORCE_NO_UNDO_LOG_SCAN): If you do not view redo logs, the InnoDB Storage engine considers uncommitted transactions as committed.

6. (SRV_FORCE_NO_LOG_REDO): do not roll back.

Add

innodb_force_recovery = 6 innodb_purge_thread = 0

Restart mysql

Only select, create, and drop operations can be executed, but insert, update, and delete operations cannot be performed.

Execute the logic export.innodb_force_recovery=0,innodb_purge_threads=1And then re-import the exported data to the database.

Summary

The above is all the content of this article. I hope it will help you learn or use mysql. If you have any questions, please leave a message. Thank you for your support for the help house.